Windows shell

The Windows shell provides users with access to a wide variety of objects necessary for running applications and managing the operating system. The most numerous and familiar of these objects are the folders and files that reside on computer disk drives. There are also a number of virtual objects that allow the user to perform tasks such as sending files to remote printers or accessing the Recycle Bin. The Shell organizes these objects into a hierarchical namespace and provides users and applications with a consistent and efficient way to access and manage objects.

Features

Desktop

For more details on this topic, see Desktop metaphor.

Windows Desktop is a full-screen window rendered behind all other windows. It hosts the user's wallpaper and an array of computer icons representing:

Files and folders
Users and software may store computer files and folders on Windows desktop. Naturally, on a newly-installed version of Windows, such items do not exist. Software installers commonly place files known as shortcuts on the desktop, allowing users to launch installed software. Users may store personal documents on the desktop.
Special folders
Apart from ordinary files and folders, special folders (also known as "shell folders") may appear on the desktop. Unlike ordinary folders, special folders do not point to an absolute location on a hard disk drive. Rather, they may open a folder whose location differs from computer to computer (e.g. Documents), a virtual folder whose contents is an aggregate of several folders on disk (e.g. Recycle Bin or Libraries) or a folder window whose content is not files, but rather user interface elements rendered as icons for convenience (e.g. Network). They may even open windows that do not resemble a folder at all (e.g. Control Panel).

Starting with Windows Vista and Windows 7 (and the corresponding versions of WIndows Server), Windows Desktop Gadgets may appear on the desktop. These gadgets are discontinued in newer versions of Windows and Windows Server, starting with Windows 8.

Taskbar

For more details on this topic, see Taskbar.

Windows taskbar is a toolbar-like element that by default, appears as a horizontal bar at the bottom of the desktop. It may be relocated to the top, left or right edges of the screen. Starting with Windows 98, its size can be changed. The taskbar can be configured to stay on top of all applications or to collapse and hide when it is not used. Depending on the version of operating system installed, the following elements may appear on the taskbar respectively from left to right:

Task switching

Task switcher is a feature present in Windows 3.0 and all subsequent versions of Windows. It allows a user to cycle through existing application windows by holding down the Alt key and tapping the Tab ↹ key. Starting with Windows 95, as long as the Alt key is pressed, a list of active windows is displayed, allowing the user to cycle through the list by tapping the Tab ↹ key. An alternative to this form of switching is using the mouse to click on a visible portion of an inactive windows. However, Alt+Tab ↹ may be used to switch out of a full screen window. This is particularly useful in video games that lock, restrict or alter mouse interactions for the purpose of the game. Starting with Windows Vista, Windows Desktop is included in the list and can be activated this way.

Windows 7 introduced Aero Flip (renamed Windows Flip in Windows 8). When the user holds down the Alt key, Aero Flip causes only the contents of the selected window to be displayed. The remaining windows are replaced with transparent glass-like sheets that give an impression where the inactive window is located.[3]

Windows 8 introduced Metro-style apps, which did not appear when Alt+Tab ↹ was pressed. (They have to switched with their own dedicated task switcher, activated through the ⊞ Win+Tab ↹ combination.) Windows 8.1 extended Alt+Tab ↹ to manage the Metro-style apps as well.

Windows 10 has a unified task switcher called Task View, which manages not only application windows but virtual desktops as well.[4]

Aero Flip 3D

Flip 3D is a supplemental task switcher. It was introduced with Windows Vista and removed in Windows 8. It is invoked by holding down the ⊞ Win key and tapping the Tab ↹ key. As long as the ⊞ Win key remains pressed, Windows displays all application windows, including the Desktop, in an isometric view, diagonally across the screen from the top left corner to the bottom right corner. The active window at the time of pressing the ⊞ Win key is placed in front of the others. This view is maintained while ⊞ Win key is held down. Tab ↹ and ⇧ Shift+Tab ↹ cycle through the open windows, so that the user can preview them. When the ⊞ Win key is released, the Flip 3D view is dismissed and the selected window comes to the front and into focus.[5]

Charms

The charms in Windows 8

Windows 8 added a bar containing a set of five shortcuts known as the "charms", invoked by moving the mouse cursor into the top or bottom right-hand corners of the screen, or by swiping from the right edge of a compatible touchpad or touch screen.[6][7][8] This feature was retained in 8.1.

Windows 10 removed the charms and moved the commands associated with them into the system menu of each application.[9] For users with touch screens, swiping from the right of the touch screen now shows Action Center.

Start menu

For more details on this topic, see Start menu.

Starting with Windows 95, all versions of Windows feature a form of Start menu, usually by this very same name. Depending on the version of Windows, the menu features the following:

Autoplay

Main article: Autoplay

Autoplay is a feature introduced in Windows XP that examines newly inserted removable media for content and displays a dialog containing options related to the type and content of that media. The possible choices are provided by installed software: it is thus not to be confused with the related Autorun feature, configured by a file on the media itself, although Autorun is selectable as an Autoplay option when both are enabled.

History

MS-DOS Executive

MS-DOS Executive file manager

The first public demonstration of Windows, in 1983, had a simplistic shell called the Session Control Layer, which served as a constantly visible menu at the bottom of the screen. Clicking on Run would display a list of programs that one could launch, and clicking on Session Control would display a list of programs already running so one could switch between them.[10]

Windows 1.0, shipped in November 1985, introduced MS-DOS Executive, a simple file manager that differentiated between files and folders by bold type. It lacked support for icons, although this made the program somewhat faster than the file manager that came with Windows 3.0. Programs could be launched by double-clicking on them. Files could be filtered for executable type, or by a user-selected wildcard, and the display mode could be toggled between full and compact descriptions. The file date column was not Y2K compliant.

Windows 2.0 made no significant change to MS-DOS Executive.

Program Manager

Windows 3.x GUI added Program Manager
Main article: Program Manager

Windows 3.0, introduced in May 1990, shipped with a new shell called Program Manager. Based on Microsoft's work with OS/2 Desktop Manager, Program Manager sorted program shortcuts into groups. Unlike Desktop Manager, these groups were housed in a single window, in order to show off Microsoft's new Multiple Document Interface.

Program Manager in Windows 3.1 introduced wrappable icon titles, along with the new Startup group, which Program Manager would check on launch and start any programs contained within.[11] Program Manager was also ported to Windows NT 3.1, and was retained through Windows NT 3.51.

Start menu

Windows 95 introduced a new shell. The desktop became an interactive area that could contain files (including file shortcuts), folders and special folders such as My Computer, Network Neighborhood and Recycle Bin. Windows Explorer, which replaced File Manager, opened both ordinary and special folders. The taskbar was introduced, which maintained buttons representing open windows, a digital clock, a notifications area for background processes and their notifications, and the Start button, which invoked the Start menu. The Start menu contained links to settings, recently used files and, like its predecessor Program Manager, shortcuts and program groups.

Program Manager is also included in Windows 95 for backward compatibility, in case the user disliked the new interface.[12] This is included with all versions of Windows up to and including Windows XP Service Pack 1. In SP2 and SP3, PROGMAN.EXE is just an icon library, and it was completely removed from Windows Vista in 2006.

The new shell was also ported to Windows NT, initially released as the NewShell update for Windows NT 3.51 and then fully integrated into Windows NT 4.0.

Windows Desktop Update

In early 1996, Netscape announced that the next release of its browser, codenamed "Constellation", would completely integrate with Windows and add a new shell, codenamed "HomePort", which would present the same files and shortcuts no matter which machine a user logged in to.[13][14][15] Microsoft started working on a similar Internet Explorer release, codenamed "Nashville". Internet Explorer 4.0 was redesigned and resulted in two products: the standalone IE4 and Windows Desktop Update, which updated the shell with features such as Active Desktop, Active Channels, Web folders, desktop toolbars such as the Quick Launch bars, ability to minimize windows by clicking their button on the taskbar, HTML-based folder customization, single click launching, image thumbnails, folder infotips, web view in folders, Back and Forward navigation buttons, larger toolbar buttons with text labels, favorites, file attributes in Details view, and an address bar in Windows Explorer, among other features. It also introduced the My Documents shell folder.

Future Windows releases, like Windows 95C (OSR 2.5) and Windows 98, included Internet Explorer 4 and the features of the Windows Desktop Update already built in. Improvements were made in Windows 2000 and Windows Me, such as personalized menus, ability to drag and sort menu items, sort by name function in menus, cascading Start menu special folders, customizable toolbars for Explorer, auto-complete in Windows Explorer address bar and Run box, displaying comments in file shortcuts as tooltips, advanced file type association features, extensible columns in Details view (IColumnProvider interface), icon overlays, places bar in common dialogs, high-color notification area icons and a search pane in Explorer.

Start menu and taskbar improvements

Windows XP introduced a new Start Menu, with shortcuts to shell locations on the right and a list of most frequently used applications on the left. It also grouped taskbar buttons from the same program if the taskbar got too crowded, and hid notification icons if they had not been used for a while. For the first time, Windows XP hid most of the shell folders from the desktop by default, leaving only the Recycle Bin (although the user could get them back if they desired). Windows XP also introduced numerous other shell enhancements.

In the early days of the Longhorn project, an experimental sidebar, with plugins similar to taskbar plugins and a notifications history was built into the shell. However, when Longhorn was reset the integrated sidebar was discarded in favor of a separate executable file, sidebar.exe, which provided Web-enabled gadgets, thus replacing Active Desktop.

Windows Vista introduced a searchable Start menu and live taskbar previews to the Windows shell. It also introduced a redesigned Alt-Tab switcher which included live previews, and Flip 3D, an application switcher that would rotate through application windows in a fashion similar to a Rolodex when the user pressed the Win-Tab key combination. Windows 7 added 'pinned' shortcuts and 'jump lists' to the taskbar, and automatically grouped program windows into one icon (although this could be disabled).

Windows Server 2008 introduced the possibility to have a Windows installation without the shell, which results in fewer processes loaded and running.[16][17]

Windows 8 removed Flip 3D in order to repurpose Win-Tab for displaying an application switcher sidebar containing live previews of active Windows Store apps for users without touchscreens.

Shell replacements

Windows supports the ability to replace the Windows shell with another program.[18] A number of third party shells exist that can be used in place of the standard Windows shell.

See also

References

  1. ↑ "Keyboard shortcuts - Windows 8, Windows RT". Windows 8, RT Help. Microsoft. Retrieved 3 September 2013.
  2. ↑ Thurrot, Paul (26 June 2013). "Hands-On with Windows 8.1: Power User Menu". Paul Thurrott's SuperSite for Windows. Penton Media. Retrieved 7 August 2013.
  3. ↑ Harvey, Greg. "How to Use Flip and Flip 3D in Windows 7". For Dummies. John Wiley & Sons.
  4. ↑ Kishore, Aseem (18 November 2015). "What Happened to Aero Flip 3D in Windows 8 & 10?". Online Tech Tips.
  5. ↑ "Flip 3D in Windows 7, Windows Vista, Windows 8". The Windows Club. Retrieved 2015-12-06.
  6. ↑ "Get to know Windows RT". Microsoft Surface support. Microsoft. Retrieved 4 January 2013.
  7. ↑ "The charms: Search, Share, Start, Devices, and Settings". Windows 8 portal. Microsoft. Retrieved 4 January 2013.
  8. ↑ "Overview". Windows 8 portal. Microsoft. Retrieved 4 January 2013.
  9. ↑ Trent, Rod (26 January 2015). "Windows 10 Build 9926: Charms is Dead, Long Live Notifications Center". SuperSite for Windows. Penton Media.
  10. ↑ Phil Lemmons (December 1983). "Microsoft Windows: A Mouse With Modest Requirements". BYTE Magazine. Retrieved 2011-05-07.
  11. ↑ "New Features in Windows 3.1". Microsoft. Retrieved 2011-05-07.
  12. ↑ Chen, Raymond (October 2010). "Windows Confidential: Leftovers from Windows 3.0". TechNet Magazine. Microsoft. Retrieved 2011-05-07.
  13. ↑ Paul Thurrott (March 3, 1997). "Netscape Constellation beta due in June". Windows IT Pro. Retrieved 2011-05-07.
  14. ↑ Jon Gordon (December 24, 2008). "Why Google Loves Chrome: Netscape Constellation". Retrieved 2011-05-07.
  15. ↑ Tim Anderson (April 4, 2010). "Jewels from the loft: launch of Delphi, Netscape’s Constellation, HTML to die, Longhorn for developers". Retrieved 2011-05-07.
  16. ↑ "What Is Server Core?". Retrieved 30 October 2011.
  17. ↑ "Understanding Windows Server 2008 Server Core".
  18. ↑ "Different Shells for Different Users". Retrieved 18 March 2013.

External links

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